How to Find the Minimum Sample Size With Unknown Population Standard Deviation. [HD]

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A formal wear store determines that its customer population has a minimum age of 27 years and a maximum age of 62 years. What is the minimum sample size needed to construct a 90% confidence interval for the mean age of its customers, assuming a margin of error of one year?

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Tags:
Math
mathematics
word problem
probability
normal distribution
z score
Sampling Distribution
confidence interval
range